#!/bin/bash - 
#===============================================================================
#
#          FILE:  ex15-1.sh
# 
#         USAGE:  ./ex15-1.sh 
# 
#   DESCRIPTION:  
# 
#       OPTIONS:  ---
#  REQUIREMENTS:  ---
#          BUGS:  ---
#         NOTES:  ---
#        AUTHOR: bucunzai (), freecityer@gmail.com
#       COMPANY: FreeCity
#       CREATED: 2011年02月19日 21时13分18秒 CST
#      REVISION:  ---
#===============================================================================

set -o nounset                              # Treat unset variables as an error


